Definition

Noun: A chemical element belonging to Group 1 of the periodic table, characterized by having a single valence electron, which makes them highly reactive, soft, and low in density. They form strongly basic (alkaline) hydroxides when reacted with water.

Usage

The term "alkaline metal" is used specifically in chemistry to refer to the set of metallic elements in the first column of the periodic table. It is a scientific and technical term.

Examples

• Noun:
  • Lithium is the lightest alkaline metal.
  • Sodium and potassium are common alkaline metals used in laboratory experiments.
  • The reactivity of alkaline metals increases down the group.

Advanced Usage

• "Alkaline metal ions": Refers to the positively charged forms (cations) of these elements, such as Na⁺ or K⁺, which are vital in biological systems.
  • The concentration of alkaline metal ions is carefully regulated in cells.

Variants and Related Words

• Alkali metal: This is the more common and technically precise synonym for "alkaline metal."
• Group 1 element: A broader term that includes hydrogen, although hydrogen is not typically considered an alkaline/alkali metal due to its non-metallic properties under standard conditions.

Synonyms

• Alkali metal (preferred term)
• Group 1 metal

Notes on Different Meanings

The term "alkaline metal" has a single, specific meaning in scientific contexts. It does not have general or idiomatic uses outside of chemistry. The common phrase is "alkali metal."

Noun

1. any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)
   • the hydroxides of the alkali metals are strongly alkaline